40280820 has 144 divisors (see below), whose sum is σ = 126258048. Its totient is φ = 9574400.

The previous prime is 40280791. The next prime is 40280831. The reversal of 40280820 is 2808204.

40280820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 398770 + ... + 398870.

It is an arithmetic number, because the mean of its divisors is an integer number (876792).

Almost surely, 2^40280820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40280820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63129024).

40280820 is an abundant number, since it is smaller than the sum of its proper divisors (85977228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40280820 is a wasteful number, since it uses less digits than its factorization.

40280820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 40280820 is about 6346.7172617031. The cubic root of 40280820 is about 342.7936494528.

The spelling of 40280820 in words is "forty million, two hundred eighty thousand, eight hundred twenty".